Aluminum alloy



Patented May 24, 1938 UNITED STATES PATENT OFFICE Hans Stendel std Heinzw l e eiiflf Dessau, Gerassignors to Junkers Fiugzeug-und-MotorenwerkeAktiengesellschai't, Dessan, Germany No Drawing. Application March 28,1935, de-

rial No. 13,435. Renewed April 22, 1938. In Germany November 22, 1934 1Claim.

Our invention relates to light metal alloys and more especially to analuminum alloy containing, besides aluminum, copper and zinc as alv 5loying metals. It is an object of our invention to provide an alloy ofthis type, which is superior to similar alloys as far as hardness,strength and elongation are concerned.

We have iound that an alloy containing, be-

sides aluminum, copper and zinc, also iron,

' possesses particularly valuable properties and that alloys containing,besides aluminum, 1 to 12 per cent copper, 1 to 12 per cent zinc and 2.0to 10 per cent iron are distinguished by great hardness and strength andpossess an elongation which is remarkable for a casting alloy.

As is known to those skilled in the art, aluminum alloys containing zincshow as a rule a comparatively great diminution of strength atincreasing temperature. In the alloy according to 50 the presentinvention this drawback is removed by the addition or iron.

The new alloy is particularly suitable for use as a material for the,manufacture 01' parts of machinery subject to sliding motion, such asbearing bushings, guides, pistons etc.

' We have found that the new alloy will possess particularly goodsliding properties, it the copper and zinc are combined thereininsubstantially equal proportions. Thus for instances an alloycontaining, besides aluminum, about g per cent copper, 8 per cent zincand 6 per cent iron, has done excellent services as a material'ior'bushings and guides.

Another alloycontaining, besides aluminum, about 2 per cent copper, 1per cent zinc and 9 per cent iron, owing to the lower percentage ofcopper, is softer than the alloy'first mentioned and possessesparticularly good running properties.

The term aluminum as used in the present specification and claimincludes not only pure aluminum but also commercial grades of aluminumcontaining the usual impurities or small amounts of. other impuritiesinsuflicient in the metal,

Various changes may be made in the details disclosed in the foregoingspecification without departing from the invention or sacrificing theadvantages thereof.

In the claim afllxed to this specification no selection .of anyparticular modification of the invention is intended to the exclusion ofother modifications thereof and the right to subsequently make claim inthe present application to any modification not covered by the claim isexpressly reserved. a

We claim:

An aluminum alloy consisting or about 8 per cent copper, 8 per centzincand 6 per cent iron, with a remainder aluminum, said alloy beingdistinguished by great hardness and strength and possessing anelongation-which is remarkable for a casting alloy.

HANS STEUDEL. I-IEINZ WIECHELL.

amount to alter the characteristic properties of

